remove json test module

Author: glaukiol1

json/json.go

@@ -18,7 +18,6 @@ import (
 	"github.com/go-python/gpython/vm"
 
 	_ "github.com/go-python/gpython/builtin"
-	_ "github.com/go-python/gpython/json"
 	_ "github.com/go-python/gpython/math"
 	_ "github.com/go-python/gpython/os"
 	_ "github.com/go-python/gpython/sys"